1.  demonstrate(v = verb.perception) demo, exhibit, present, show - give an exhibition of to an interested audience; "She shows her dogs frequently"; "We will demo the new software in Washington"
is one way to show
Derived forms noun demonstration₁, noun demonstration₅, noun demonstrator₁
Sample sentences: Somebody ----s something; Something ----s something; Somebody ----s somebody something; Somebody ----s something to somebody; Somebody ----s somebody with something

2.  demonstrate(v = verb.cognition) establish, prove, shew, show - establish the validity of something, as by an example, explanation or experiment; "The experiment demonstrated the instability of the compound"; "The mathematician showed the validity of the conjecture"
is one way to affirm, confirm, corroborate, substantiate, support, sustain
Derived form adjective demonstrative₂
Sample sentences: Somebody ----s something; Something ----s something; Somebody ----s that CLAUSE

3.  demonstrate(v = verb.communication) attest, certify, evidence, manifest - provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness"
is one way to bear witness, evidence, prove, show, testify
Derived form adjective demonstrative₂
Sample sentences: They demonstrate that there was a traffic accident

4.  demonstrate(v = verb.social) march - march in protest; take part in a demonstration; "Thousands demonstrated against globalization during the meeting of the most powerful economic nations in Seattle"
is one way to dissent, protest, resist
Derived forms noun demonstration₃, noun demonstrator₃
Sample sentences: Somebody ----s; Somebody ----s PP

demonstrate, v.
1 tr. show evidence of (feelings etc.).
2 tr. describe and explain (a scientific proposition, machine, etc.) by experiment, practical use, etc.
3 tr. a logically prove the truth of. b be proof of the existence of.
4 intr. take part in or organize a public demonstration.
5 intr. act as a demonstrator.

Etymology:
L demonstrare (as DE-, monstrare show)

VB  number, count, tally, tell, call over, run over, take an account of, enumerate, muster, poll, recite, recapitulate, sum, sum up, cast up, tell off, score, cipher, compute, calculate, suppute, add, subtract, multiply, divide, extract roots, algebraize, check, prove, demonstrate, balance, audit, overhaul, take stock, affix numbers to, page, amount to, add up to, come to.

VB  demonstrate, prove, establish, make good, show, evince, manifest, confirm, corroborate, substantiate, verify, settle the question, reduce to demonstration, set the question at rest, make out, make out a case, prove one's point, have the best of the argument, draw a conclusion, follow, follow of course, follow as a matter of course, follow necessarily, stand to reason, hold good, hold water, convince, persuade (belief).

VB  make manifest, render manifest, bring forth, bring forward, bring to the front, bring into view, give notice, express, represent, set forth, exhibit, show, show up, expose, produce, hold up to view, expose to view, set before one, place before one, lay before one, one's eyes, tell to one's face, trot out, put through one's paces, bring to light, display, demonstrate, unroll, lay open, draw out, bring out, bring out in strong relief, call into notice, bring into notice, hold up the mirror, wear one's heart upon his sleeve, show one's face, show one's colors, manifest oneself, speak out, make no mystery, make no secret of, unfurl the flag, proclaim, indicate, disclose, elicit, be manifest, appear, transpire, speak for itself, stand to reason, stare one in the face, rear its head, give token, give sign, give indication of, tell its own tale.